/etc/fstab
LABEL=backup /mnt/backup  auto  noauto,x-systemd.automount,x-systemd.idle-timeout=10,rw 0 2
systemctl daemon-reload
systemctl list-unit-files --type automount
systemctl cat mnt-backup.automount
systemd-mount --list
systemctl start mnt-backup.automount
journalctl -fu mnt-backup.automount
systemctl cat mnt-backup.automount
# /run/systemd/generator/mnt-backup.automount
# Automatically generated by systemd-fstab-generator

[Unit]
SourcePath=/etc/fstab
Documentation=man:fstab(5) man:systemd-fstab-generator(8)
Before=local-fs.target

[Automount]
Where=/mnt/backup
TimeoutIdleSec=10s